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          init.rc 语法解析
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            <div class="post-description">rom 移植最怕的就是启动不了， 拿不到启动日志，只能从各个可能的环节去分析， init.rc 是内核启动init加载的脚本，控制了系统启动过程中加载的服务。</div>

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        <h2 id="init-rc"><a href="#init-rc" class="headerlink" title="init.rc"></a>init.rc</h2><pre><code>文档在       system/core/init/readme.txt 

init.rc 位于 system/core/rootdir/init.rc 
          和 bootable/recovery/init.rc
          由 system/core/init/init.cpp 加载</code></pre><h2 id="语法"><a href="#语法" class="headerlink" title="语法"></a>语法</h2><pre><code>Actions, Commands, Services, Options, 
以行为单位, 各种记号以空格来隔开
反斜杠可用于记号间插入空格, 字符串格式也可以防止被分割成多个记号
行末的反斜杠用于分行, 注释以#号开头, 允许空格

Actions 和 Services 声明一个新的Section</code></pre><h2 id="Actions"><a href="#Actions" class="headerlink" title="Actions"></a>Actions</h2><p>定义一些命令, 由事件触发器或属性触发器来执行</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">on trigger &amp;&amp; [&lt;trigger&gt;]</span><br><span class="line">    &lt;command&gt;</span><br><span class="line">    &lt;command&gt;</span><br><span class="line">    &lt;command&gt;</span><br><span class="line">    ...</span><br></pre></td></tr></table></figure>

<h2 id="Services"><a href="#Services" class="headerlink" title="Services"></a>Services</h2><p>Services是一个程序, 由init进程启动, 一般运行于init进程的子进程, 启动时会通过fork 方式生成子进程. 启动之前会判断文件是否存在</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">service &lt;name&gt; &lt;path-name&gt; [argument]</span><br><span class="line">    option</span><br><span class="line">    option</span><br><span class="line">    ...</span><br></pre></td></tr></table></figure>

<h2 id="Options"><a href="#Options" class="headerlink" title="Options"></a>Options</h2><p>决定如何以及何时去运行service</p>
<pre><code>critical
    device-critical 超过4次, 设备会重启进入recovery

disabled                
    不会自动启动, 需要显示通过名称启动

setenv &lt;name&gt; &lt;value&gt;   
    在launched 进程设置环境变量

socket &lt;name&gt; &lt;type&gt; &lt;perm&gt; [&lt;user&gt; [&lt;group [&lt;seclabel]]]
    在launched 进程通过 fd 创建一个domain socket 名为 /dev/socket/&lt;name&gt; 
    &lt;type&gt; 必须为dgram, stream, seqpacket 其中一个

user &lt;username&gt;
    在执行当前服务前, 改变username

group &lt;groupname&gt; [&lt;groupname&gt;]* 
    在执行当前服务前, 改变groupname, * 在这里是什么意思呢? 

seclabel &lt;seclabel&gt;
    在执行当前服务前, 改变seclabel

oneshot 
    服务已存在, 不重启

class &lt;name&gt; 
    为当前服务指定一个类

onrestart
    在一个服务重启时, 执行下面的命令

writepid &lt;file...&gt;
    写child pid 到 forks 时的files</code></pre><h2 id="Triggers"><a href="#Triggers" class="headerlink" title="Triggers"></a>Triggers</h2><p>一个Action 只能有一个事件trigger, 可以有多个属性trigger</p>
<pre><code>boot                    
    init.rc 装载后触发

device-added-&lt;path&gt;     
    指定设备被添加时触发

device-removed-&lt;path&gt;   
    指定设备被移除时触发

service-exited-&lt;name&gt;  
    在特定服务退出时触发

erly-init               
    初始化之前触发

late-init               
    初始化之前触发

init                    
    初始化时触发(在/init.conf 被装载之后)</code></pre><h2 id="Commands"><a href="#Commands" class="headerlink" title="Commands"></a>Commands</h2><pre><code>bootchart_init

chmod &lt;octal-mode&gt; &lt;path&gt;

chown &lt;owner&gt; &lt;group&gt; &lt;path&gt;

class_start &lt;serviceclass&gt;

class_stop &lt;serviceclass&gt;

class_reset &lt;serviceclass&gt;

copy &lt;src&gt; &lt;dst&gt;

domainname &lt;name&gt;

enbale &lt;servicename&gt;

exec [ &lt;seclabel&gt; [ &lt;user&gt; [ &lt;group&gt;  ]* ] ] -- &lt;command&gt; [ &lt;argument&gt; ]*

export &lt;name&gt; &lt;value&gt; 

hostname &lt;name&gt; 
    设置hostname

ifup &lt;interface&gt; 
    上线 interface 网络

insmod &lt;path&gt; 
    安装module 到 path

load_all_props

load_persist_props

loglevel &lt;level&gt; 

mkdir &lt;path&gt; [mode] [owner] [group]

mount_all &lt;fstab&gt; [ &lt;path&gt;  ]* [--&lt;option&gt;]

mount &lt;type&gt; &lt;device&gt; &lt;dir&gt; [ &lt;flag&gt;  ]* [&lt;options&gt;]

powerctl

restart &lt;service&gt;

restorecon &lt;path&gt; [ &lt;path&gt;  ]*

restorecon_recursive &lt;path&gt; [ &lt;path&gt; ]*

rm &lt;path&gt;

rmdir &lt;path&gt; 

setprop &lt;name&gt; &lt;value&gt;

setrlimit &lt;resource&gt; &lt;cur&gt; &lt;max&gt; 

start &lt;service&gt;

stop &lt;service&gt;

swapon_all &lt;fstab&gt;

symlink &lt;target&gt; &lt;path&gt;

sysclktz &lt;mins_wset_of_gmt&gt;

trigger &lt;event&gt;

unmount &lt;path&gt;

verity_load_state

verity_update_state &lt;mount_point&gt;

wait &lt;path&gt; [ &lt;timeout&gt; ]

write &lt;path&gt; &lt;content&gt;</code></pre><h2 id="Imports"><a href="#Imports" class="headerlink" title="Imports"></a>Imports</h2><pre><code>import &lt;path&gt; </code></pre><h2 id="Properties"><a href="#Properties" class="headerlink" title="Properties"></a>Properties</h2><pre><code>init.svc.&lt;name&gt;</code></pre><h2 id="Bootcharting"><a href="#Bootcharting" class="headerlink" title="Bootcharting"></a>Bootcharting</h2><h2 id="Systrace"><a href="#Systrace" class="headerlink" title="Systrace"></a>Systrace</h2><h2 id="Debugging-Init"><a href="#Debugging-Init" class="headerlink" title="Debugging Init"></a>Debugging Init</h2><p>默认加载init的时候不存日志, 都定向到了dev/null</p>
<p>service akmd /system/bin/logwrapper /sbin/akmd<br>可以重定向到android logcat</p>

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